a heterozygous tall pea plant is crossed with a short plant the probability that an F1 plant will be tall is?
Answers for Biology A Unit 4: Genetics Lesson 2: Applying Mendel's Principles I
Keep in mind the answers might change in the future.
The correct answers are marked with *****
1- A homozygous tall pea plant is crossed with a short plant. the probability that an F1 plant will be tall is
A. 25%
B. 50%*****
C. 75%
D. 100%
2- In the Punnett square shown in Figure 11-1, which of the following is true about the offspring resulting from the cross?
A. About half are expected to be short.
B. All are expected to be short.
C. About three-fourths are expected to be tall.
D. All are expected to be tall. *****
3- Which principle states that during gamete formation genes for different traits separate without influencing each other's inheritance?
A. Principle of dominance
B. Principle of independent assortment *****
C. Principle of probabilities
D. Principle of segregation
4- the Punnett square shown below follows the law of independent assortment and shows the results of a F1 cross between a female cat heterozygous for both coat color and the tail length (BbSs) and a male cat homozygous recessive for both coat and color and tail length (bbss)
The probability that the offspring will be brown colored cat with a long tail is___.
A. 25%*****
B. 50%
C. 75%
D. 100%
1. B
2. D
3. B
4. A
I hope this helps! :)
These are all correct!
B
D
B
A
Correct :)
B D B A
1.a
Well, if we're talking about pea plants, it's safe to say that they've got a leg up on being tall! So, the probability of an F1 plant being tall is pretty high. I mean, these plants have been reaching for the sky for generations! Let's just say the chances are looking up, quite literally!
To determine the probability of an F1 plant being tall, we need to understand the principles of Mendelian genetics. Mendelian genetics describes the inheritance of traits through the interaction of alleles (different forms of a gene) from both parents.
In this case, the tall plant is heterozygous, meaning it has one dominant allele (T) for tallness and one recessive allele (t) for shortness. The short plant is homozygous recessive (tt), meaning it has only the recessive allele (t) for shortness.
When the two plants are crossed, their alleles randomly combine to produce offspring with various genotype possibilities.
Let's consider the Punnett square to analyze the cross between the tall plant (Tt) and the short plant (tt):
| t | t
-----------------------
T | Tt | Tt
T | Tt | Tt
In the Punnett square, each box represents a possible genotype combination resulting from the cross. The four possible outcomes are Tt, Tt, Tt, and Tt. This means that all the F1 offspring will have the genotype Tt.
Since the dominant allele T determines tallness, any individual with at least one T allele will be tall. Both Tt and Tt have the dominant allele T, resulting in a 100% chance that the F1 offspring will be tall.
Therefore, the probability that an F1 plant will be tall is 100%.
Ts x ss ... Ts, Ts, ss, ss
a Punnett square is pretty straight forward